Prioirty Valve

Priority Valve

Used in the load sensing system, the Priority Valve controls the oil flow to the power steering unit. The Priority Valve sends the oil to a general functioning part when steering is in neutral. During the steering, it sends the oil to the power steering unit promptly. Hence, it is named "Priority Valve".

Static Signal Type
As a no-oil-flow system at LS port except the relief valve is operated, the structure and design is simpler than the dynamic system. It is applicable where the demand for the response and circuit stability is not high.

Benefits with Priority Valve

• Using only one pump, both steering and actuating can be operated.
• The oil just as much as the steering system needs to operate is supplied to the PSU and the rest is supplied to the actuators.
• Even in the pressure fluctuation in the line of the steering, the steering is operated smoothly.

Static Signal	Dynamic Signal

Dynamic Signal Type
It allows a small amount of oil to flow at LS line to the PSU by making a path with orifice at spool. Control pressure can be easily adjusted by modifying the size of the orifice. While it is more complicated than the static system, response and steering capability is much better.

• Quick response
• Easily adjustable control pressure
• Excellent steering performance due to the pressure compensation.

Direct Mounting Priority Valve
Direct Mounting Priority Valve is mounted to the power steering unit directly(Applicable to the Integral power steering unit). This kind of direct mounting priority valve usually has a built-in check valve. Compared with the general priority valves, this has the following advantage.

• Check valve built in on CF-line or LS-line
• Reduce the pipe line and noise, wheel kickback due to compact size.
• Circuit diagram below shows the Static Signal and Dynamic Signal type

Static Signal Type	Dynamic Signal type with Check Valve

Direct Mounting Priority Valve

Pipe Mounting Priority Valve

Code and Specification